Clear aligners are an alternative to traditional braces for correcting teeth positioning. They are made of clear plastic and are fabricated to fit each individual's mouth. Aligners are worn for 20 hours a day and changed every 3 weeks as the teeth move incrementally into the desired position. Treatment time with aligners can be as short as 3 months or up to 6 months. Aligners offer advantages over traditional braces such as being removable, easier to clean, more comfortable, and less likely to irritate gums.